Restore Your Buick’s Performance and Reliability
Is your 2004-2006 Buick Rendezvous running rough, stalling unexpectedly, or showing a persistent check engine light? These are classic signs that the brain of your engine, the Engine Control Module (ECM), may be failing. As a technician with over two decades of experience, I’ve seen firsthand how a faulty ECM can cause a cascade of frustrating and hard-to-diagnose problems. This isn’t just an inconvenience; it affects your vehicle’s fuel economy, emissions, and overall drivability. Don’t let a bad computer keep you off the road.
We offer a dependable and straightforward solution: a genuine, used OEM Engine Control Module, part number 12592124. This isn’t just a part in a box. Before we ship it, we flash it with the latest GM-certified software specifically for your vehicle. All you need to do is provide us with your Vehicle Identification Number (VIN) at checkout. This critical step ensures the module communicates perfectly with your Rendezvous’s systems right out of the box, saving you from expensive trips to the dealership for programming. This is the same process we use in the shop to guarantee a successful repair.
Is Your Vehicle Showing These Symptoms?
- ✔ Check Engine Light is on with codes like P0601, P0606, or other internal processor faults.
- ✔ The engine cranks but refuses to start.
- ✔ Unexplained stalling or rough idling, especially when warm.
- ✔ A noticeable drop in fuel mileage.
- ✔ The transmission shifts erratically or feels harsh.
- ✔ Communication errors with your scan tool.
Case Study: A Tricky Diagnosis
A customer brought in a 2005 Buick Rendezvous with an intermittent no-start condition that had stumped two other shops. It would run fine for days, then refuse to start, with no clear pattern. After checking all the basics—battery, starter, fuel pressure—I hooked up my professional scan tool. I noticed that during the no-start events, the scan tool would lose communication with the ECM entirely. This is a tell-tale sign. We swapped in one of our VIN-programmed modules, and the problem vanished. The original ECM had an internal hairline fracture on the circuit board that would separate when it heated up, cutting power. This replacement part solved a month-long headache for the owner in under an hour.
A Straightforward Guide to Installation
- ✔ Safety First: Always disconnect the negative terminal from your vehicle’s battery before starting any electrical work.
- ✔ Locate the ECM: On the 2004-2006 Rendezvous, the ECM is typically found in the engine compartment on the driver’s side, often near the air filter housing.
- ✔ Disconnect Connectors: Carefully release the locking tabs on the electrical wiring harnesses and pull them straight out from the module. Avoid pulling on the wires themselves.
- ✔ Remove the Old Module: Unbolt the old ECM from its mounting bracket. It’s usually held in place by a few 10mm bolts.
- ✔ Install the New Module: Mount your new, pre-programmed ECM onto the bracket and securely fasten the bolts.
- ✔ Reconnect Everything: Plug the wiring harnesses back into the new module until they click into place. Reconnect the negative battery terminal.
- ✔ Final Step: Your vehicle may require a security relearn procedure, which can often be done by cycling the key. Turn the ignition to the ‘ON’ position for 10-15 minutes, then ‘OFF’ for 10 seconds. Repeat this cycle three times. The vehicle should then start and run smoothly with its new brain.
Verified Vehicle Compatibility
This module is a direct replacement for service numbers 12581144, 12588472, 12592124, and 19260507. It is guaranteed to fit the following vehicles and configurations:
- Buick Allure: 2005-2008 (3.6L)
- Buick LaCrosse: 2005-2008 (3.6L)
- Buick Rendezvous: 2004-2006 (3.6L)
- Cadillac CTS: 2004-2007 (Base models, check ID)
- Cadillac SRX: 2004-2006 (3.6L)
By purchasing this VIN-programmed 2004-2006 Rendezvous ECM, you’re not just buying a part; you’re buying a reliable, time-saving solution that gets your vehicle back to factory-specified performance. Let us handle the complex programming so you can focus on the simple installation.
Frequently Asked Questions
Does this ECM need to be programmed by a dealer?
No. We program the module to your vehicle’s specific VIN before shipping it. This means it is ready for installation right out of the box, with no extra programming required.
Is this a new part?
This is a high-quality, tested, and fully functional used OEM part sourced from a salvaged vehicle. We ensure it meets or exceeds original performance standards.
How do I provide my VIN?
After you complete your purchase, you will receive instructions on how to send us your vehicle’s 17-digit VIN. We cannot ship the part until we receive this information.
What if my original part number is different?
This module, 12592124, is a direct replacement for several service numbers, including 12581144, 12588472, and 19260507. As long as your vehicle is on the compatibility list, this part will work.
Will this fix my specific problem?
This part resolves issues directly caused by a failing ECM, such as certain no-start conditions, communication errors, and internal processor fault codes. Proper vehicle diagnosis is always recommended to confirm the ECM is the point of failure.